A database function is a set of instructions that allow users to interact with a database. The term 'database function' can refer to four different operations: SORT (4 letters), ENTER (5 letters), EDIT (4 letters), and sorted (6 letters). SORT allows users to organize data in a certain order, ENTER allows users to add new data to the database, EDIT allows users to modify existing data, and sorted allows users to view the data in the order it was sorted. Additionally, sorts (5 letters) is a variation of SORT that allows users to organize data in multiple ways.